Excavating-dipper.



[LEPARL BXGAVAT G DIFFER. APPLICATION FILED JAN.27,1912.

Patented Dec. 10,1912.

3 SHEETSSHEBT l.

A. E. PARK. Y BXCAVATING nPPER.

s v APPLICATION FILED JAN. 27, 1912*. ,fl?, l 35g 3 SHEETS-SHEET Vieww v Wr /WTOMS Patented Dec. 10, 1912.

3 sHBBTpSHBETS' A. E. PARK. EXGAVATING DIFFER. APPLICATION FILED JAN.27,1912.

Patented Deo. 10, 1912.

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Bannon MIN-NEAroLIs; nmrnrfsoa"n To all whomz't may concern." Be it. known that I, ALBERT E. PARK, of

' Minneapolis, Hennepin countyf'Minnesotm useful Imwhich the' following is a specification. i; y.

My inventionkrlates to excavating' "dippers or shovelsand particularly .to thattype in which the: dipper is` .mounted 'onvan arm `th'at is pivotally attached to a boom to allow the dipper to be drawn or pulled through the lmaterial* to be excavated.

. per as it breaks'out lof the-excavation with.

part of this specifica ion, Fi

. The primaryl object-ofmyinvention isto provide a d ipper'having a cutting ed ewhich. can be drawn substantially p'a'ra el with the bottom line of the excavation'..A

A further obj'ectto provid'anexcavab. ing'dipper that easilyr controlled and operated'.

furtherl'oaliiect is, tbl-reduce the strain" on the boom axid'\.the mechanism on' which illedjwith the excavated materia-1; Y

The invention consists-*generally 1n a frame pivotally connected to 'a boom, a dip- 4per having its rear. portionV pivotally'conner'tfl with said frame, and aslidi'ng pivotal connectionat its forwarder receiving end with said frame,j said- `sliding connection; permitting theraising and lowering of 'the'` cutting edge of 'the shovel. In the 'accompanying drawings forming ellis a side view,v of a boomwit'h .the-d1pper'attached,

ready to be dropped into thematerial tobe' excavated, the 'dotted lines showing the dipa full Riad, Fig. L2 is nrend elevation. of the dipperattachedato the boom, Fi 3 is a side view showing the dipper in its umping position. t

In the drawing, 'Arepresents the dipper 'p and B the boom.

'C and C are the pairs of dipper arms. The rear arms C are connected to the rear portion of the dipper by. a hinge or' pivot E and the lower ends of the armslQ' are provided vwith radial slots. G to receive n -headed bosses or lugs F which are mounted on the 'forward portion of the dipper; `The end walls G of the slots'G form stops to limit the movement ofthe bosses F therein. The arms- C and-C are connected by suitable braces intermediate totheir ends and at their upper ends are `joinedtogether and pivotally attached to the boom B by a EXcvATING-DIPPER.

lSpecification of Letters Patent. Patented Dec. 10, 1912.

application aled January-27, 1912. lserial No. 673,768. y

pivot H, These arms form'-therefore, in

4effect a skeleton frame pivotally connected with the -boomand supporting the dipper..

A' loading line I is connected to the dipper, 60'

preferably as near the cutting edge as possible, as indicated. in Fig. 3, and the unloading line J' is attached to the rear of the dipper by any suitable means, and preferably as near the lower'edge of the dipper as is 65 practicable.

In operation, the shovel is brought to the position'indicated by full lines in Fig. 1, the bosses -F beingjat the upper ends of the slots G and the cutting edge ofthe shovel is l :inclined forwardly and downwardly toward theA bottom of the excavation. -The cutting edge-of'the'shovel with respect to the arms -C and C, the position of the bosses F in the slots G, and the position ofthe dipper on 757` the pivot E, remain relatively the same until after the dipper. passes'the vertical dotted lines shown in Fig. 1, or a linepdrawn through the center of the pivot H. After i passing this point, the cutting edgefollows so thexpullof the loading line I, the bosses-F sliding down theslots at their lower ends until'-they contact with theend walls' G', thev .shovel swinging on the pivot-E to allow this 'upward and backward tilting dipperuntil it reaches the position indicated by dotted lines -in Fig. 1. I thereby obtain fa. jlon"erl travel of the dipper on and parallel with the bottomline of the excavation with aminimum-amount of power to fill the Of the .and Iam .able to make a smooth excavation p rand also greatly reduce-the strain on the oom B I am aware that dippers are in use with A arms rigidlyA secured tov the dipper and swinging on a pivotal connection with theaboom. In an apparatus of thisv kind, the nearer the dipper approaches itspfull load positiomthe nearer the pull of the loading line is exerted parallel to the boom, thereby `I amable to not only greaty reduce the .,.i-.igether,..the upper portions of said arms being pivotally connectedwith said boom,

a dipper having lits rear portion pivotally 1.5 connected with the lower ends of lone pair of arms and its forward portion slidably connected with the other pair of arms.

3. The combination, with a boom, of arms pivoted thereon, a dipper having its forward and rear portions connected with said arms, loading and unloading lines for said dipper, `the connections of the forward portion of said dipper with said arms allowing said ldipper to rotate slightly and its cutting edge to follow the pull of said loadingv line-at .a predetermined point inv the. travel of said dipper.

4. The combination, with a boom, of arms arranged in pairs and pivoted thereon,'sai"d arms being secured together to form a rigid frame, adipper having its'rear portion pivotally connected to one pair of arms, the other pair Vof varms having curved slots in the lower ends thereof, bosses mounted -on the forward portion of said. dipper and adapted to slide in said slots, and loading and unloadin lines attached to said dipper.

5. The com ination, with a boom, ot arms arranged in pairs ,and secured rigidly to- 40 geth'er and pivotally `connected with said boom, a dipper having its rear portion pivotally connected with one pair of arms, the

other pair of arms having longitudinal slots means connecting t therein, bosses mounted on the forward portion oise-id dipper to enter' said slots and 4e slide therein, .the end Walls of said slots forming stops to limit the movement of said bosses, said bosses being normally at the upper ends of said slots but moving to the? lower ends 'of'said slots when said dipper 5o swingspast the lcenter of the .pivots of said arms on said boom, and loading and unloading lines attached to said dipper.

6, The combination, with a boom, o 'a frame pivoted thereon, a dipper having its rear portionpivotally connected with said. trame, the forward ortion of said dipper having a limited siding movement with respect to said frame at a predetermined point in the travel of said dipper. f .e0

'7; The combination, with a boom, oit-a'4 trame pivoted thereon, a dipper havingits vrear portion pivotally connected vwith said frame and its forward port-ion slidably connectedwith said frame, said sliding-connection allowing said dipper to swing on its rear pivots afterfpassing a vertical line drawn through the pivots of saidframe on said boom. l

8. The combination, 'with a boom, of a dipper, means pivotally connecting the rear portion of said flipper with said boom,

e forward portion of said .dipper with said boom and allowing. .a limited rotary lmovementvof said dipper on 7i. said rear connecting means at a predeterf mined point in the movement of said dipper, and loading and unloading lines 'for said dipper. I

.In witnes's whereof, I have'hereunto set 8e my hand this 2d day 'of January, 1912.

ALBERT E. PARK.

Witnesses:

GnNi-i vn E. SoRENsEN, CATHERINE H. REHFUss. 

